I have recently built a circuit with a 555 set in monostable mode which was supposed to turn on three bright LEDs for 51 seconds when a button was pressed.The button was connected with some long wires.After I built it,I decided to connect the battery and was surprised to see that the LEDs turned on even if nobody was pushing the button.I connected and disconnected the battery several times and it kept happening.
simulate this circuit – Schematic created using CircuitLab
It worked poorly in this configuration and after I added a resistor between the positive rail and the trigger pin it seemed to work fine,but I didn't check it too much.What made the IC go mad?Did the long wires make it sensible to static electricity?Was the missing resistor causing the problem?